# ch06 - CHAPTER SIX 6.1 a AB Heat liquid V constant BC...

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CHAPTER SIX 6.1 a . AB: Heat liquid -- constant V o BC: Evaporate liquid -- increases, system remains at point on vapor-liquid equilibrium curve as long as some liquid is present. 100 C. V T = CD: Heat vapor - -T increases, V increases . b. Point B : Neglect the variation of the density of liquid water with temperature, so ρ = 1.00 g/mL B and 10 mL V = Point C : H 2 O (v, 100 ° C) 10 mL 1.00 g 1 mol 0.555 mol mL 18.02 g n = = 0.555 mol 0.08206 L atm 373 K 17 L 1 atm mol K C C C C C C nRT P V nRT V P = = = = 6.2 a . mm Hg final P = 243 . Since liquid is still present, the pressure and temperature must lie on the vapor-liquid equilibrium curve, where by definition the pressure is the vapor pressure of the species at the system temperature. b . Assuming ideal gas behavior for the vapor, m(vapor) (3.000 - 0.010) L mol K 243 mm Hg 1 atm 119.39 g (30 + 273.2) K 0.08206 L atm 760 mm Hg mol g = = 4 59 . m(liquid) 10 mL 1.489 g mL g = = 14 89 . m m(vapor) + m(liquid) =19.5 g total = x = 4.59 g vapor / g total vapor 19 48 0 235 . . = 6.3 a. log . . . . * .370 10 2 7 09808 1238 71 45 217 2 370 10 234 5 p p = + = = = mm Hg b. ln ± ± ln / ln / . * * .0 . p H R T B H R p p v v T T + + = − + ⇒ − = = = − 1 760 118 3 4151 2 1 5 2 1 d i b g b g b g 1 1 1 77 273.2 K 1 29 273.2 K K B p H R T v = + = + + = ln( ) ± / ln . . * 1 1 118 3 18 49 b g b g 4151 K 29.5 273.2 K 6- 1

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